Does anybody know how to use this thing? I've spent a good hour trying to get it aligned on the bar but with no luck. Either it clamps the chain and it can't travel, or I can't get the file in the groove, or can't get it out. This is a newish chain and I suppose if the cutters were wider with use, I might be able to get the file in easier, but now it seems that taking the file out of the jig, putting it into the cutter groove, and then back into the jig for each cutter is the only way I can kind of get it to work. So, does anybody have a good technique for using this thing??